The most versatile cape I have seen for Poser is the one in Predatron's "Superhero Complete" package.  It's made for Victoria 3 but can be parented to any figure successfully.

Good points:  It has great scaling and movement morphs, lots of material zones and several options to change the default appearance.  Of all the posable capes I've used, this one is the absolute best.

Bad points:  The "Sawtooth Edge" morph is pretty rubbish so if you want to do a pic with Batman, I advise you make a transmap for the bottom, rather than use the morph.

One other tip for use:  Ensure you check "Normals Forward" when you use it otherwise it doesn't render particularly well.

Coppula eam se non posit acceptera jocularum.

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